Reenforcing frame for concrete structures



Jan. 4, 1927. 1,613,392

G. G. GREULICH I REENFORCING FRAME FOR CONCRETE STRUCTURES Filed July 5, 1922 Sheets-Shea. 1

Jan. 4,1927. r 1,613,392

G. G. GREULICH REENFORCING FRAME FOR CONRETE STRUCTURES Filed July 5. 1922 P Sneets-Shee Baezzfr .1 2 1 41 zzeym; I

Patented Jan. 4, 1927.

GERALDG. GBEULEGH, O13 CLEVELANDQOHIO:

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Application filed July 5-,

large measure prohibitingthe' fabrication other than in especially equipped shops.

To overcome the objection ren zufding s-- pensive equipment, my invention contentplates the provision ofa frame having the main and secondary bars so connecteo that the'en'tire strength of the webreen cement may be obtained without danger of slip occurring at the junction or point of engagemeat between the main and secondary bars.

Furtherobjects include thcprovision ofa reenforcing frame wherein the main and secondary bars are maintained in "permanent engagement without requiring special shop equipmentfor fabricating the units and without requiringtho entire fabrication to be performed at the factory. In this conncction my invention provides for a frame which may be readily fabricated in the field by the use of hand tools.

In connecting the main and secondary bars my invention is directed toward a means of engagement wherein the main bars may be kept uniform in cross section, whereby the strength of the bars is maintained throughout its length.

in accomplishing the above objects, 1 provide a frame construction wherein the main bars may be formed with suitable indenta tions on opposite sides and at spaced intervals; the indentations being so formed that the cross sectional area of the bar remains substantially uniform throughout its length. A thin web of metal reinaininp, between the inner ends of opposed indentations may then be punched out wherever desired for attaching secondary bars to the main bars, the attachmentbeing efiected by extending the secondary bars through the holes in the main bars and then clinchin the ends.

1S22L Serial No. 573,022

ne'means "for carrying out my invention will be more fully set forth inthe following description which pertains to the accompanying drawings, and the essential features will be summarized in the claims.

In the drawings, Fig. 1 is a; diagrannnatic view of a fabricated reenforci-n'g frame con-- structedaccording tomy invention and embedded in a concrete beam; Fig. 2 is an elevationof a portion of the frame removed from the beam 3 Fig. 3 is-"a section taken on the line 3-3 of Fig. l; 4.- and 5 are sections through the frame on the lines 4.- land 5 5 ofFig; 2; Fig. (his a. plan View of a portion of a. main bar having a circular cross section;constructed according to my invention; Figs. 7, 8- and 9 are Fig. 6 ;v 10 is a plan view of a main bar having" a square cross section and deformed sh-owniir G; a-nd'Figs; Ll, 12 andlfil are sections taken on corresponding lines in Fig. 10] p Referring now to the *lrawingsgand particularly to Fig. 1-, 10 indicates a tensile orma-in bar e1nbedded in abeam' 11 which extends bet-ween columns 12 and 13 respec tively. Similarly, l4 and 15 indicate other tensile or main barsdisposed above the bar' 10 and connected thereto with shear bars L6. The method of formingthe main bars together with the manner of attachment to the shear bars constitutes important characteristics of my invention as will be hereinafter described.

The main bars, as shown in Figs. 7 to 11, may be either circular or" non-circular in cross section andmay be deformed to provide a series of openings which are shown as oppositely disposed indentations 20 and 21. In forming'the bar, it may be passed through suitable rolls which are so formed as to maintain the cross sectional area at the holes, the same as at other points on the bar. If. during the forming operation, it is found that a thin web 22 remains at the center of the bar, these webs may be punched out with a hand punch to admit the shear bars where desired. By arranging; the rolls so that the indentations are flared outwardly as illustrated in Figs. 8 to 12, the bar itself acts as a die whereby the web may be easily removed by the use of a small machine operated or hand punch. In this way, the frames may be fabricated either at the shop or in the held as desired.

"ions taken onatlie corresponding lines in iii) i lo

The secondary or shear bars, as illustrated in Figs. 2 to 5, comprise strips of light bars, the ends of which are formed to extend through the openings in the main bars and to be bent over on the opposite side, thus clinching the shear bars to the main bars. This manner of attachment insures rigidity in the frame construction sufficient to pre' vent displacement while the concrete is being poured. The shear bars are preferably arranged vertically as indicated in Fig. 2 except the end bars, asat 16*, which are placed obliquely as illustrated in Figs. 1 and 2. This in effect forms a triangular brace which prevents the main bars from collapsing, while the concrete is being poured. lVith this form of construction, the point of maximum shear may be heavily reenforced by placing the shear bars through adjacent indentations. As the center of the beam is approached, however, the bars maybe diminished in number. This may be easily accomplished by placing the shear bars in alternate indentations or in every second indentation, etc., as desired.

My invention is especially useful for field fabrication in that the only equipment necessary is a small hand operable punch, which 'is usually standard equipment for field shops. In this way, the ditliculties encountered in shipping large fabricated frames are overcome. In field assembly the various shear bars may be shipped with the ends partially bent, so that the main bars may be placed over the ends of a series of shear bars and quickly secured thereto. This construction is advantageous from a structural point of view, in that the cross sectional area remains substantially uniform throughout the main bars, and further that the indentations provide additional means for anchorage to the concrete.

Having thus described my invention, I claim l. A reenforcing frame for concrete structures comprising a pair of main bars having holes therein and being parallel for substantially the entire length thereof, and secondary bars extending therebetween and through said holes, some of said secondary bars being at right angles thereto and at least one of said secondary bars extending obliquely intermediate the main bars, and being remain bars each having a series of equally spaced indentations therein, secondary bars extending at substantially a right angle to and between the main bars, and each having the ends thereof hook-shaped and in engagement with the main bars adjacent the indentations whereby the secondary bars are independently removable from the main bars, and a diagonal secondary bar extending between the main bars adjacent the end of one of them.

In testimony whereof, I hereunto affix my signature.

GERALD G. GRE ULICH. 

